How to trigger run a trigger

Hai All

I created a trigger

Create or replace trigger T1

Before inserting on Table_name

For each line

Start
--
--
---
--
end;

And now, I inserted a line in the table how I see the shooting of a trigger

Pls tell me with a small example


Thanks and greetings

Srikkanth

Hello

Check this example.

SQL> create or replace trigger trg_emp
  2  before insert
  3  on emp
  4  for each row
  5  begin
  6  dbms_output.put_line('Trigger begins');
  7  dbms_output.put_line('Emp No is: '||:new.empno);
  8  dbms_output.put_line('Emp Name is: '||:new.ename);
  9  dbms_output.put_line('Emp HireDate is: '||:new.hiredate);
 10  dbms_output.put_line('Trigger ends');
 11  end;
 12  /

Trigger created.

SQL> insert into emp(empno,ename,hiredate)
  2  values(111,'Scott',sysdate);
Trigger begins
Emp No is: 111
Emp Name is: Scott
Emp HireDate is: 04-MAR-10
Trigger ends

1 row created.

You have not explicitly call or execute a trigger. Once created the trigger runs automatically when this event occurs. In the above scenerio, I created before trigger Insert that is executed before the insert stmt is complete. If you look carefully all stmts in the trigger are printed first, and then you get * 1 row created * message.

If triggers are called automatically when the specified event occurs.

Check out the link for more details below:
http://download.Oracle.com/docs/CD/B19306_01/AppDev.102/b14251/adfns_triggers.htm

Twinkle

Tags: Database

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